Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (2): 240-245.doi: 10.1007/s40242-022-2147-1

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Fe2O3-MWNTs Composite with Reinforced Concrete Structure as High-performance Anode Material for Lithium-ion Batteries

WANG Suhang1, ZUO Jinxin1, LI Yongliang1, ZHONG Yiming2, REN Xiangzhong1, ZHANG Peixin1, SUN Lingna1   

  1. 1. College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, P. R. China;
    2. Babel International College, Perth WA 6100, Australia
  • Received:2022-04-20 Online:2023-04-01 Published:2023-03-16
  • Contact: SUN Lingna E-mail:lindasun1999@126.com,sunln@szu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(Nos.21471100, 21704066), the Guangdong Basic and Applied Basic Research Foundation, China(No.2021A1515010241), and the Shenzhen Natural Science Fund, China(the Stable Support Plan Program) (No. 20200813081943001).

Abstract: AFe2O3-MWNTs(multi-walled carbon nanotubes) composite with a reinforced concrete structure was fabricated employing a two-step method, which involves a sol-gel process followed by high-temperature in situ sintering. This Fe2O3-MWNTs composite, intended to be used as an anode material for lithium-ion batteries, maintained a reversible capacity as high as 896.3 mA·h/g after 100 cycles at a current density of 100 mA/g and the initial coulombic efficiency reached 75.5%. The rate capabilities of the Fe2O3-MWNTs composite, evaluated using the ratios of capacity at 100, 200, 500, 1000, 2000 and 100 mA/g after every 10 cycles, were determined to be 904.7, 852.1, 759.0, 653.8, 566.8 and 866.3 mA·h/g, respectively. Such a superior electrochemical performance of the Fe2O3-MWNTs composite is mainly attributed to the reinforced concrete construction, in which the MWNTs function as the skeleton and conductive network. Such a structure contributes to shortening the transport pathways for both Li+ and electrons, enhancing conductivity and accommodating volume expansion during prolonged cycling. This Fe2O3-MWNTs composite with the designed structure is a promising anode material for high-performance lithium-ion batteries.

Key words: Lithium-ion battery, Anode material, Fe2O3-multi-walled carbon nanotubes(MWNTs) composite, Sol-gel, Reinforced concrete structure